3. Which of the following is not a triangular number?(a) 21(b) 36(c) 4 – InterviewSolution

1.	3. Which of the following is not a triangular number?(a) 21(b) 36(c) 45(c) 54
Answer» -step explanation:54 is not a triangular number. The NEAREST number to it is 55 that is a triangular number.Please MARK as BRAINLIEST

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